Giardia intestinalis is the most prevalent parasite in the world; it is acquired through ingestion of food or water that has been contaminated with cysts of Giardia. Children are more commonly infected and generally present with diarrhea. Individuals with giardiasis can be asymptomatic or suffer from diarrhea, abdominal pain, anorexia, and emesis. G. intestinalis is a peculiar microorganism with genetic characteristics of a primitive eukaryote. In developed countries, Giardia is regarded as a reemerging infectious agent because of its increasing role in outbreaks of diarrhea in day care centers. About 200 million people in Asia, Africa, and Latin America have symptomatic giardiasis and there are some 500,000 new cases per year. In Mexico, G. intestinalis can be isolated by fecal analysis from 7% to 68% of patients with diarrhea. Reported frequencies of infection in other countries are as follows: United States 1-6%; Panama 10%; Venezuela 9%; Brazil 4-11%; Egypt 4-15%; China 10%; Germany 3-27%; Italy 9%; and Spain 24%. Giardia is also one of the most common enteric parasites found in dogs and cats. The presence of human Giardia in domestic and farm animals suggests a zoonotic potential for giardiasis. However, at present, it cannot be determined whether cysts isolated from both humans and dogs originate primarily from the human Giardia group.
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The use of dumbbells gives you a much more comprehensive strengthening effect because the workout engages your stabilizer muscles, in addition to the muscle you may be pin-pointing. Without all of the belts and artificial stabilizers of a machine, you also engage your core muscles, which are your body's natural stabilizers.